There is a concern for the risk of respiratory tract cancer from breathing the smoke caused by frying beef, pork and soy based foods. Other airborne contaminants such as asbestos are still present in many older buildings. Green tea is rich in flavonoids, which may explain why Asians have less lung cancer, despite their higher smoking rates. Drinking green tea also provides phytocannabinoids (which ease nausea, pain and have a calming effect) without the potential for increased lung cancer risk associated with smoking marijuana.